public dynamic Visit(ReturnStm stm)
{
var node = new TreeNode("ReturnStm")
{
Tag = stm.Node
};
if (stm.ReturnExpression != null)
{
node.Nodes.Add(new TreeNode("ReturnExpr")
{
Nodes = { Visit((dynamic)stm.ReturnExpression) }
});
}
return(node);
}
public dynamic Visit(ReturnStm stm)
{
var type = stm.ReturnExpression.GetExprType();
if (type == SymbolType.Void || type == SymbolType.Unknown)
{
_codeGen.Return();
}
else
{
var operand = Visit((dynamic)stm.ReturnExpression);
_codeGen.Return(operand);
}
return(null);
}
/// <summary>
/// Rule: ReturnStm -> RETURN (Expr)? ;
/// </summary>
protected override object EvalReturnStm(ParseTree tree, params object[] paramlist)
{
var returnStm = new ReturnStm {
Node = this
};
var exprNode = GetNode(TokenType.Expr);
var returnType = SymbolType.Void;
var funcImpl = AstCreator.FuncImplementation.Peek();
if (exprNode != null)
{
var expr = (ExpressionBase)exprNode.Eval(tree);
returnType = expr.GetExprType();
returnStm.ReturnExpression = expr;
}
if (funcImpl.ReturnType != SymbolType.Unknown && funcImpl.ReturnType != returnType)
{
throw new ParseException("Возвращаемые значения должны быть одинакового типа", GetNode(TokenType.RETURN));
}
AstCreator.FuncImplementation.Peek().ReturnType = returnType;
return(returnStm);
}
public dynamic Visit(ReturnStm stm)
{
stm.OrderNumber = _count;
//Visit((dynamic)NextReturnStm());
return(null);
}
public dynamic Visit(ReturnStm stm)
{
stm.ReturnExpression = (ExpressionBase)stm.ReturnExpression.Optimize();
return(stm);
}